*BSD News Article 3643


Return to BSD News archive

Newsgroups: comp.unix.bsd
Path: sserve!manuel!munnari.oz.au!uunet!gumby!wupost!dsuvax.dsu.edu!ghelmer
From: ghelmer@dsuvax.dsu.edu (Guy Helmer)
Subject: ESDI disk performance under 386BSD
Message-ID: <1992Aug14.170148.22228@dsuvax.dsu.edu>
Organization: Dakota State University
Date: Fri, 14 Aug 1992 17:01:48 GMT
Lines: 17

Having been running 386bsd 0.1 on a 25Mhz 386 w/ WD1007V-SE2
controller connected to a Wren VI (330Mb) disk and 16Mb of memory,
I've noticed that the system seems seriously disk-bound.  Any work on
the disk drive seems to take forever - mkdir takes a few seconds to
execute; extracting a tar file brings the system to a crawl.  Not
knowing much about BSD internals yet, I am wondering if there is a
fairly simple answer to the obvious question of how to improve the
disk's performance.  The only thing that comes to mind is the
possibility that the disk driver is too slow and doesn't keep up with
the disk's interleave, requiring one whole revolution of the disk for
each sector read.

Any thoughts on things I could tune or code I could rewrite :-) ?

-- 
Guy Helmer, Dakota State University Computing Services - ghelmer@dsuvax.dsu.edu
White congressmen can't jump, but they sure can bounce.